Harry Potter Producer David Heyman told us at the DVD launch that singer/songwriter Jarvis Cocker (seen at left) will not only be creating some music for Harry Potter and the Goblet of Fire – he will be appearing at the Yule Ball as a member of the popular wizarding group, The Weird Sisters.

“The Weird Sisters, we are figuring out what it’s going to be. I think it’s going to be a really exciting group. Jarvis [Cocker] will be involved. He will help us write the songs and he will be one member of the Weird Sisters. He’s doing fantastic with the lyrics. Jarvis is a creator, he likes to be involved in interesting projects.”